Improved watch-makers  lathe



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Letters Patent No. 92,545, dated July 13, 1869.

IMPROVED WATCH-MAICERS' LATHE.

TheASchedule referred to in these Letters Patent and making part of the same.

To all whom 'it may concern:

Be it known that we, C. O. HOWELL-and JOHN Bernina?, of St. Jol1nsbury,in the county of Galedonia, and State of Vermont, have invented a new and useful Improvement in XVatch-Makers Chucks; and we do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing, forming part of this specification.

This invention relates to a new and useful improvement in chucks for use, by watch-makers and others,

in centring and turning small articles connected with their work; and

It consists in arranging a fastening-jaw in comoination with a ball-andsocket joint, all constructed .it is the stem, attached to the part j' of the socket, which secures the chuck to the faceplate or spindle of the lathe.

The jaw A is trise-cted from a fine central hole to the periphery. The back portion is conical, and the sections are forced vtoward each other by means of the finger-nut fi, which works wit-h a screw-thread on the neck C, and in contact with the conical back part of the jaw, as is colnmon in chucks for light work.

In practical operation, the piece to be turned is first secured, at one end, in the jaw A, by means of the nut i, and its opposite end adjusted upon a' fixed point. The same may then be centred in the usual or any preferable manner, and the' ball B tightened, to hold it in the desired position, by turning the nuts e f.

Having thus described our invention, Y v

We claim as new, and desire to secure by Letters Patentl The combination of the nut c' and jaw A with a ball-and-socket joint, substantially as and for the nurposes h'erein shown and described.

O. C. ROWELL.

JOHN BELKNAP.

lVitnes-ses:

lHEnoN M'. HOWARD, H. B. DAVIS. 

